Air travel continued to be a challenge for holiday commuters Tuesday morning, as bad weather continued to pound areas of the East and Midwest.

Winter storm warnings in New England wreaked havoc with flights, leaving a ripple effect at San Francisco International Airport, where 13 outgoing and 15 incoming flights were canceled by 8 a.m., according to airport officials.

Dozens of other flights were delayed, most caused by the chain reaction that came with the bad weather. The delays prevented many customers from making connecting flights, and that impact trickled down to later flights.

Flights out of Newark, N.J., and Philadelphia affected several United Airlines flights, but the going was smoother through the airline’s hub in Chicago than it was Monday. Ten of the 13 canceled flights out of San Francisco International Airport and seven of the 15 incoming cancellations were United flights.

Oakland International Airport reported five outgoing cancellations through 9 a.m., and Norman Minetta San Jose International Aiport reported one. One incoming flight to San Jose had been canceled, but Oakland did not report any cancellations to arriving flights.

Passengers were urged to call the airlines or check flightstats.com to see whether flights were leaving or arriving on schedule.